Crank-fastening.



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UNITED STATES I` APATENT OFFICE.

LUCIEN SEYMOUR, OF GENEVA, OHIO, ASSIGNOR TO THE GENEVA CYCLE COMPANY,OF SAME PLACE. A

' CRANK-FASTENING.

SPECIFICATION forming part of Letters Patent No. 627,601, dated June 27,1899.

' Application filed February 12, 1898; SerialjNo. 670,038. (No model.)

To all whom t may concern.-

Be it known that I,r LUcIEN SEYMOUR, a

- citizen of the'United States, residing atGe-` neva, in the county ofAshtabula and AState of Ohio, have invented a certain new and usefulAImprovement in Crank-Fastenings, ofwhich the following is a full, clear,and exact description, reference being had to the accompanying drawings.

The object of my invention is to provide crank-shaft fastenings forbicycles which shall be cheap in construction, efficient in operation,and neat in appearance and in which the parts may be readily andconveniently detached.

The invention consists in the combination of parts hereinafterdescribedand definitely enumerated in the claim.

The drawings clearly illustrate my invention. i

Figure 1 is a vertical central longitudinal section through thecrank-shaft and bearings.

Fig. 2 isa perspective'view of the end of a crankfarm, the spider, andaportion of the crank-shaft, which parts cooperate and are shown inposition for attachment to each other. Fig. 3 is an end View of theinvention, as shown in Fig. l, being taken from the righthand end ofthat figure.

Referring to the parts by letters, A represents the barrel of a suitablecrank bracketV the ball-cup B', which the ring C screws onto,V

is a continuation of the thread which screws into the barrel. ball-cups,whereby they may be turned by a suitable Spanner-wrench, while theperiphery of the ring C is suitably milled to provide for its turning bythe fingers.

In the interior of the barrel is a tube or The ball-cup B has a flangeb;

Holes bf are provided in thel sleeve F, which carries the cones E.'lhese cones-are rigidly secured to the sleeve by being forced onto itagainst shoulders f thereon. Between the cones 'and the ball-cups rollsets of balls D. Suitable ball-retainers 'b2 are provided in each ofthe4 ball-cups, as shown, to confine the balls therein when the partsare separated.

When the parts so far described are in position, the bearings may beadjusted and locked without regard to the cranks or the crank shafts,the bearings being entirely self-contained? between the sleeve F and thebarrel of the hanger.

The crank-shaft consists of two parts or shafts G G, 'each of which isadapted to be secured at one end to a crank-arm, and has its other endcut od diagonally, as shown in the drawings'at g. These diagonal faces gcontact with each other when the shaft is in position, whereby when theportions of the shaft are drawn tightly together they slip on each otherslightly, and thus become tightly clamped to the sleeve F. The means forso forcing the two shafts together is furnished by the bolt H, whichextends through a longitudinal hole g in the shafts and has at one end ahead h and at the other screw-threads which screw through internalthreads g4 near the end of the shaft G'. A nut h screws over theprojecting end of the bolt and acts as a jam-nut. The two crank-arms andthe spider K for the sprocket-wheel L are secured to the crankshaftsbefore the bolt H is inserted. This securing is accomplished' by 'thefollowing means: On each portion of the crank-shaft is formed a iiangeg2. This iiange is preferably Iintegral with the shaft, extending fromit at right angles. The approximately rectangular Vforniof this flangeshown in the drawings is deemed preferable; but it is only essential -asimilar recess la', which receives a projection j' on the hub of thecrank-arm J. The

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flanges g2 and the projection j and the corresponding recesses arepreferably slightl y beveled at their edges to insure a tightengagement. I

The outer ends of the crank-shafts G G are screw threaded, as at g3. Onthese screwthreads turn conical nuts M, which are adapted to stand inconical depressionsj2 in the hubs of the crank-arms. These nuts, whichmaybe tightened by the application of a spanner-wrench to notches m inthe nuts, lock the crank-arms tightly to their shafts. It will th us beseen that one crank-arm and the spider for the sprocket-wheel may besecured to its shaft and the other crank-arm secured to its shaftindependently of each other and independently of the hanger andbearings. When the parts are so secured, the shafts G G are inserted inthe sleeve F and the bolt H passed through the shafts and screwedtightly into place and the nut 7L turned on the bolt-head 7l and thehead of the nut h covering the corresponding nuts M, and thus hidingthem from view. The assembled parts thus present a very neat appearance.

On the inner face of the hub of the crankarm .I' is formed a flange js,whereby a substantiallyannular space is provided between such hub andthe bearing parts, in which a felt washer may be inserted, if desired.Provision may be made at the other end of the hanger for a washerbetween the hub of the sprocket-wheel and the hanger.

In assembling the parts the cup B, carrying its quota of balls securedby the ball-retainer b2, is first screwed int-o place in the barrel A.The sleeve F, with its cones, is then placed in the barrel, and theball-cup B', with its balls and carryingthe locking-ring C on itsperiphery, is screwed into the barrel until the bearing is properlyadjusted. The locking-ring C is then turned tightly against the end ofthe barrel. The bearing is thus adj usted and locked. The shaft G isthen inserted through the spider and crank-arm J,

and these parts are locked together by the nut M. Similarly thecrank-shaft Gl is secured to the crank-arm J. The crank-shafts G and G'are then inserted into the sleeve F, the bolt H passed through them, andthe nut h'v turned into place, thus completing the assembling ot' theparts. It will thus be seen that each portion of my crank-shaft andbearing is in reality self-contained, for the balls are held in theball-cups by their retainers before the ball-cups are screwed into thebarrel of the hanger and the cones are permanently secured to the sleeveF, and after that sleeve and the ball-cups, with their balls, have beenput in place the bearing is locked without regard to the crank-shafts orcranks. Likewise after the spider has been put on the shaft G and thecrank-arm J and nut M put in place this portion of the mechanism islocked together without regard to the rest, and so is the crank-shaft Gand its arms J By providing a movable spider instead of one permanentlysecured to the crank-shaft I furnish means for the attachment to thatshaft of sprocket-wheels, carrying their own hubs, or wheels havingsimply a rim and web portion adapted to be secured to the spider-arms.

I claim as my invention- The combination of a hollow crank-shaft havinga thread on its end, a crank-arm having a hub surrounding said shaft andthread, a recess in the outer side of said crank-hub, a nut M screwingonto said shaft and lying within said recess, a screw-threaded boltprojecting through the hollow shaft and a nut screwing onto the end ofthe bolt and extending over said `nut M, substantially as dcscribed.

In testilnony whereof I hereunto aliix my signature in the presence oftwo witnesses.

LUCIEN SEYMOUR. Y

lVitnesses:

HENRY MEANS, EDITH IIARTE.

